Larry's not the only cat on the parliamentary block - George Osborne's tabby cat Freya also resides on Downing Street. However, tensions over territories have arisen, and Larry and Freya were photographed fighting last year. This was downplayed by Cameron's spokesperson (no, seriously), who said that the pair "co-exist". Albeit not harmoniously.

Former US president George W Bush attempts to salute and hold onto his Scottish terrier Barney - often referred to as the 'First Dog' - as they get off of Air Force One at Andrews Air Force Base. He didn't quite manage it.

Barney was even namechecked during a speech Bush gave about the Iraq war, during which he was quoted as saying: "I will not withdraw even if Laura and Barney are the only ones supporting me."

Ex-US president George Bush Sr attempts to usher English springer spaniel Millie back to the White House as he leaves for a meeting in Toronto back in 1989.

Millie was referred to as "the most famous dog in White House history", and was mentioned in Bush's speech during his 1992 bid for re-election. He's quoted as saying: "My dog Millie knows more about foreign affairs than these two bozos", in reference to Bill Clinton and Al Gore.

Socks was Bill and Hillary Clinton's beloved black and white cat, who they adopted in 1991 prior to Bill Clinton's election as president. When the former first family acquired Buddy, a labrador retriever, Socks was rehomed with Clinton's secretary Betty Currie after the two pets fought like cat and dog (sorry).

Rufus was a miniature poodle belonging to former British prime minister Winston Churchill. The pooches were reportedly treated like family. Eating in the dining room on a Persian rug placed beside Churchill, no-one reportedly began their meal until Rufus (and, later, his successor Rufus II) had been served.

Cherie Blair poses with black and white cat Humphrey, who served under the premierships of Margaret Thatcher, John Major and Tony Blair and was appointed to Chief Mouser to the Cabinet Office. The image of Cherie and Humphrey together below was released following press reports of a rift between the pair, along with a statement from their spokesperson which read: "Number 10 is Humphrey's home and, as far as the Blairs are concerned, it will remain his home."

The photo was later used on the cover of Private Eye along with the caption coming from Humphrey's mouth: "I am going to hit the mouse running."